Messages in this thread Patch in this message | | | Subject | [PATCH 3/11] KVM: Fix gva_to_gpa() | From | Avi Kivity <> | Date | Tue, 30 Jan 2007 14:39:00 -0000 |
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gva_to_gpa() needs to be updated to the new walk_addr() calling convention, otherwise it may oops under some circumstances.
Use the opportunity to remove all the code duplication in gva_to_gpa(), which essentially repeats the calculations in walk_addr().
Signed-off-by: Avi Kivity <avi@qumranet.com>
Index: linux-2.6/drivers/kvm/paging_tmpl.h =================================================================== --- linux-2.6.orig/drivers/kvm/paging_tmpl.h +++ linux-2.6/drivers/kvm/paging_tmpl.h @@ -443,31 +443,17 @@ static int FNAME(page_fault)(struct kvm_ static gpa_t FNAME(gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t vaddr) { struct guest_walker walker; - pt_element_t guest_pte; - gpa_t gpa; + gpa_t gpa = UNMAPPED_GVA; + int r; - FNAME(walk_addr)(&walker, vcpu, vaddr, 0, 0, 0); - guest_pte = *walker.ptep; - FNAME(release_walker)(&walker); - - if (!is_present_pte(guest_pte)) - return UNMAPPED_GVA; - - if (walker.level == PT_DIRECTORY_LEVEL) { - ASSERT((guest_pte & PT_PAGE_SIZE_MASK)); - ASSERT(PTTYPE == 64 || is_pse(vcpu)); + r = FNAME(walk_addr)(&walker, vcpu, vaddr, 0, 0, 0); - gpa = (guest_pte & PT_DIR_BASE_ADDR_MASK) | (vaddr & - (PT_LEVEL_MASK(PT_PAGE_TABLE_LEVEL) | ~PAGE_MASK)); - - if (PTTYPE == 32 && is_cpuid_PSE36()) - gpa |= (guest_pte & PT32_DIR_PSE36_MASK) << - (32 - PT32_DIR_PSE36_SHIFT); - } else { - gpa = (guest_pte & PT_BASE_ADDR_MASK); - gpa |= (vaddr & ~PAGE_MASK); + if (r) { + gpa = (gpa_t)walker.gfn << PAGE_SHIFT; + gpa |= vaddr & ~PAGE_MASK; } + FNAME(release_walker)(&walker); return gpa; } - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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